## Description
This PR adds a new method of protecting a user profile when switching to
it: server login. When enabled, switching to the user requires
authenticating with the server again via Quick Connect or username &
password. This is basically the same as the official client.
### Related issues
Closes#321
Related to #1330 - might cause merge conflicts
Related to #1287 - definitely causes merge conflicts
### Testing
Emulator with various uses cases including auto sign-in, switching
between server login & PIN protection, and removing the protection
## Screenshots
N/A, the login looks identical as adding a new user
## AI or LLM usage
None
